It means another response or another plurk has come in.

Yep, I finally got this place about figured out.

you can turn off the ding by clicking on the little blue speaker thinhy on the left edge of your timeline.

...or it's kinda like in It's a Wonderful life: "Every time a bell rings, someone sticks a pin in Sam and James."

Haha. Or an angel gets a new plurk response?

i honestly forgot about that dinger. i've had mine off for months

I might wind up turning it off but I kind of doubt I'll notice new stuff as quickly without it.

I think it's useful at first, but might get irritating after a while

oh and heyas, again